How did I miss this so far!?
First of all, thanks so much for the starday drawing
Now I guess I might as well leave some advice I guess!
Cera: Cera looks great, almost a bit cute

However, something with her face seems just slightly off. Can't say exactly what since I'm also not that great with dinosaur anatomy and all that but, if I were to guess, her face seems just slightly too thin (though don't take my word on it

)
Ducky: You picked a great pose there

It's really very well visible though that you referenced a pose from the tv-series
I think her neck seems a little long (though we have seen Ducky's renditions of being a longneck more than just once throughout the franchise

).
Her face definitely isn't perfect but it's still good-looking I'd say

Particularly the area around her beak looks a little off I think.
The rest are just slight nitpicks I noticed (because I draw Ducky so often

)
The area around her chest is a bit too thin

I think the lower part of her tail bulges a bit more where it connects to the main body though generally the tails looks awesome!
Ducky is usually drawn with these lines/rings around her arms. You forgot them (or intentionally left them out?) for the right arm, however this doesn't look wrong at all here

Maybe draw a short curved line going downwards from her arm

...and yes, Ducky is cross-eyed
Now don't mind my nitpicks, I'm just happy I actually see that something's off for a change (as I'm usually rather on the receiving ends of those

) Wonderful artworks! (and I'm already waiting to review your next drawing

)